removing noise from anime/cartoon

[ThePi7on]

Hi, i'm encoding (x265) some anime Blu Rays with Hybrid, I'm relatively new to video editing and the source has this noise that I don't really know how to remove.
I'd like to have perfectly flat colors, if I can remove it or at least reduce it with an Hybrid filter or an avs script, how do I do it?

source info


Screenshot from the source


close up

[manono]

It would be much better for you to post a 10 second sample and not just a picture. A sample with steady movement because I doubt the framerate is really 29.97fps.

And you downloaded this, didn't you? So it's not really a Blu-Ray, is it? And it's already been reencoded by someone?

[jagabo]

You can reduce the noise (you may lose some detail too) but you'll have to upload a sample (not reencoded) of the source. Also be aware that removing the noise may lead to posterization.

[pandy]

NLM should be quite efficient in your case.
https://ffmpeg.org/ffmpeg-filters.html#nlmeans
http://avisynth.nl/index.php/Image_Processing_Algorithms#NL_Means
http://avisynth.nl/index.php?title=External_filters&oldid.My#Denoisers

[ThePi7on]

It would be much better for you to post a 10 second sample and not just a picture. A sample with steady movement because I doubt the framerate is really 29.97fps.

And you downloaded this, didn't you? So it's not really a Blu-Ray, is it? And it's already been reencoded by someone?

Yes, I downloaded it, I had no choice for a number of reasons, but I can ensure you this is a blu ray and it's not been reencoded.
I'll post a sample as soon as possible.

[ThePi7on]

NLM should be quite efficient in your case.
https://ffmpeg.org/ffmpeg-filters.html#nlmeans
http://avisynth.nl/index.php/Image_Processing_Algorithms#NL_Means
http://avisynth.nl/index.php?title=External_filters&oldid.My#Denoisers

I'll try it, thank you.

[themaster1]

dfttest and deen filters work great for noise in animes

[ThePi7on]

https://mega.nz/#!nE4wTIgJ!VeZYmvVoFgTgB2pFm8ic_iXdt8PDFTkXg83ygg9scLY here's the sample

[ThePi7on]

dfttest and deen filters work great for noise in animes

Thank you, if you can, can you please give me the parameters I've to set, based on the sample I uploaded?

[jagabo]

https://mega.nz/#!nE4wTIgJ!VeZYmvVoFgTgB2pFm8ic_iXdt8PDFTkXg83ygg9scLY here's the sample

That's a terrible sample. It's not representative of the body of the show. And it doesn't have much in the way of dark areas where the noise shows up most.

[ThePi7on]

2nd sample https://mega.nz/#!PY4h2AYa!01GjM33wm5OBT7eB78amg8no0lbwQiADr8dRmGPNCAo

[jagabo]

The grain in the background sky is intentional. Is that what you're trying to get rid of? There is a little bit of mosquito noise around the dark lines in the character animation. You can eliminate most of that with Deen(mode="a3d", rad=1, thrY=2, thrUV=3). But that also blurs the thin lines in the guy's hair. You can raise the threshold values and radius in Deen to get more noise reduction but watch out for blurring of other details and posterization (banding) artifacts.

[ThePi7on]

The grain in the background sky is intentional. Is that what you're trying to get rid of? There is a little bit of mosquito noise around the dark lines in the character animation. You can eliminate most of that with Deen(mode="a3d", rad=1, thrY=2, thrUV=3). But that also blurs the thin lines in the guy's hair. You can raise the threshold values and radius in Deen to get more noise reduction but watch out for blurring of other details and posterization (banding) artifacts.

It's not that noise that I want to get rid of. It's the noise that you see in all the black space in the guy's hair in the second clip. I'm fine with the noise around the lines an in the background.

[jagabo]

It's not that noise that I want to get rid of. It's the noise that you see in all the black space in the guy's hair in the second clip. I'm fine with the noise around the lines an in the background.

I just wanted to be sure. You can use Histogram(mode="luma") to accentuate the noise and test your filtering.

LWLibavVideoSource("sample2.m2ts") 
src = last
Deen(mode="a3d", rad=1, thrY=1, thrUV=1)
Interleave(src,last) # show before and after
Histogram(mode="luma") # show noise

Deen there is sufficient to get rid of most of that noise.

[ThePi7on]

It's not that noise that I want to get rid of. It's the noise that you see in all the black space in the guy's hair in the second clip. I'm fine with the noise around the lines an in the background.

I just wanted to be sure. You can use Histogram(mode="luma") to accentuate the noise and test your filtering.

LWLibavVideoSource("sample2.m2ts") 
src = last
Deen(mode="a3d", rad=1, thrY=1, thrUV=1)
Interleave(src,last) # show before and after
Histogram(mode="luma") # show noise

Deen there is sufficient to get rid of most of that noise.

Thank you very much. Newbie question, when I try to play it on mpchc it doesn't recognize LWLibavVideoSource, I assume it's a plugin, but I can't find a download link for it, where do I download it?

[jagabo]

LWLibavVideoSource is a part of the LSMASH package.
http://avisynth.nl/index.php/LSMASHSource

Note that the script interleaves frames of the source and filtered video then uses Histogram() to show the noise. If you want to just see the before and after images, remove the last line. If you want to see just the results, remove the last two lines.

[ThePi7on]

LWLibavVideoSource is a part of the LSMASH package.
http://avisynth.nl/index.php/LSMASHSource

Note that the script interleaves frames of the source and filtered video then uses Histogram() to show the noise. If you want to just see the before and after images, remove the last line. If you want to see just the results, remove the last two lines.

Works great, thank you for you time.